Improved mode of preparing molds for hub-boxes



' UNITED STATES JAMES G. HOLT, OF CHICAGO, ILLINOIS.

IIVIPROVED MODE OF PREPARING MOLDS FOR HUB-BOXES.

Specification forming part of Letters Patent No. 55,296, dated June 5, 1866.

To all rwhom it may concern: f

Be it known that I, JAMES G. HOLT, of Chicago, in the county of Cook and State ot' Illinois, have invented an Improved Mode of Preparin01 Molds for Hub-Boxes; and I do hereby declare that the following is afull, clear, and exact description thereof, reference being had to the accompanying drawings, making a part of this specification, in which- Figure 1 is an elevation of one side of my improved machine for preparing sand molds for casting hub-boxes. Fig. 2 is a top view of the vertically-sliding plate to which the tools are secured. Fig. 3 is a vertical section through the upper portion of the machine. Figs. 4 and 5 are enlarged views of the tool for finishing the molds. Fig.6is ahorizontal section through the tool. Fig. 7 represents, in section, the hubbox molds prepared, ready for the reception of the cores. Fig. 8 is a sectional View representing the molds and cores together, ready for receiving the metal. Figs. 9 and 10 represent the hubboX in section.

Similar letters of reference indicate corresponding parts in the several figures.

This invention relates to a machine which is adapted for finishing sand molds for casting hub-boxes, such molds having been previously prepared with conical patterns by any of the well-known modes.

The natureof myinvention consists in a tool which will scrape, smooth, and pack the surfaces of sand molds, and at the same time which will give the proper shape to them for producing perfect castings of hub-boxes, as will be hereinafter described. A

To enable others skilled in the art to understand my invention, I will describe its construction and operation.

In the accompanying drawings, A represents a horizontal table having two rails, a a, upon it, by means of which the asks can be easily moved up to and from the tools which prepare the molds. Four rods, A', project perpendicularly from the corners of the table A, and are connected together at their upper ends by means of four arms, B, which are united together at the middle of theirlength, so as to form a central bearing for a verticallysliding shaft, B', and also a support for a horizontal bevel spur-wheel, B2, that is used for turning said shaft, as will be hereinafter further explained.

C represents ahorizontal frame, which is secured at its four corners to sliding tubes or collars a' a' on the vertical rods A', as shown in Figs. l, 2, and 3. From two sides of this frame G project two curved arms, b b, to which two vertical rack-bars, b' b', are secured. These rack-bars project down on each side of the bed or table A through suitable guides, and engage with the teeth of pinion spurwheels that are rotated by means of a shaft, b2, and hand-wheel b3, as shown in Fig. l. By means of the racks and pinions and the hand or crank wheel b3 the frame C can be elevated or depressed at pleasure.

The centralshaft,B', is rotated by means of a hand-wheel, D, which is keyed to a horizontal shaft that has its bearings upon the arms B, and which has a pinion-wheel, D', keyed to it, which engages with the horizontal spur-wheel B2. This wheel B2 is connected to the shaft B' by means of a key-tenon which enters a longitudinal .groove in the shaft B', so as to allow this shaft to be moved up and down with the frame C. i

The shaft B' has a pinion spur-wheel, c, keyed on its lower end beneath the frame C, which pinion engages with the teeth of four pinion spur-wheels, c', that are keyed to tubes c2, which have the tapering hub-box tools E on their lower ends, as shown in Fig. 3. These tools are supported beneath the frame O by means of collars d above the frame and collar-bearings d' beneath the frame, which latter are supported upon a plate, C', that is connected to frame C by means of studs, as shown in Fig.1. By this arrangement the four tools E will be rota-ted simultaneously when the main shaft B' is rotated. A rod, c, passes loosely through each one of the tubes c2, and connects at its upper end with a verticallymovable frame, F, and at its lower end with a sliding plate, f.

The frame F is elevated or depressed by means of curved inclined planes h, which arey secured to an oscillating ring, F'. Theinclined strips h are connected to slotted boxes on the ends of the frame F in such manner that when the ring F' is moved round in one direction the frame F and its rods e will be raised, and

when the movement of ring F is reversed said rods and frame will be depressed.

The ring F' is supported in a horizontal position by means of posts projecting up from the main frame, and this ring is connected to the posts by pins or screws which pass through curved slots made through the ring. The handle F2 is used for moving the ring F.

The tools which shape and smooth the inside Walls of the sand molds are shown clearly in Figs. l, 3, 4, 5, and 6, and as all of these tools are made alike, I will describe the construction of but one of them.

The tool E tapers from a cylindrical portion, g, to its lower end, and terminates at this end in a cylindrical stem, g', which serves as a lower steadying-pin for the tool during the operation of finishing the molds, as will be further described. The body of the tool E is semicircular, and its upper portion is constructed with cutters i i (shown in Figs. 4: and 6) for producing the enlargements in the molds, as shown in Fig. 7.

Two narrow plates, jj, are inserted into recesses formed in the tool E nearits upper end, so as to slide freely in a direction at right angles to the movement of the plate f.` These plates j are connected to the plate f by pins projecting from the form er and en terin g oblique slots through the latter, so that when the plate f is moved up and down the plates j will be moved outward and inward.

During the operation ofthe tools E in smoothing and shaping the molds in the asks the ends of the plates j are within the circumference of the enlargements of the tools, and when the tools have completed their work, and just before they are elevated, the ring Fl is moved so as to thrust out said plates j and form .the depressions `in the molds shown in Fig. 7, which produce the ears or flan ges j in the casting, as shown in Figs. 9 and 10. The plates j are then brought within the circumference of the tools before `these tools are raised from the molds.

The molds,which are tirstprepared from conical plane-faced patterns, are slightly smaller than the tools E, for the purpose of enabling these tools to finish the molds by pressing, scraping, and smoothing their sides. In this way a perfectly-formed mold can be made, and all of the molds thus made will be of a uniform size and shape.

In Fig. 7 I have represented the molds as they7 would appear upon withdrawing the tools, and in Fig. 9 I have represented the molds and cores put together for receiving the metal and producing a casting of the form shown in Fig. 9. The mode of preparing the cores will be described in another application for a patent which I shall make.

In order to facilitate the upward movement of the frame G and its attachments after each operation of completing a mold ora number of,

molds in one flask, I propose using a counterweight, W, which is attached to a chain that passes over pulleys P P and connects with the upper end of the main shaft B', as 'shown in Fig. l. rIhis weight will materially'aid in lifting the frame C.

The hub-box tools E are steadied and prevented from vibrating as they descend into the molds by means of the stems g', which are formed on said tools, entering holes Z, which lare made through the bottom plates of the asks, which holes are in the center of their respective molds, as shown in Fig. 8.

I have Vhereinabove described a machine which is provided with four molding-tools for producing four perfect molds at one operation but I do not conne my invention to the making of four or any definite number of molds at a time, as the same contrivances may be used for making a single mold -or a great number of molds at one time.v

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is f l. Making the interior form of a sand mold for hub-boxes by means substantially as herein described, the said means being constructed and operating substantially as set forth.

2. The combination of movable plates j and sliding plate f with a tapering tool, E, for iinishing sand molds for hub-boxes, substantially JAMES G. HOLT.

as described.

Witnesses:

CEAS. B. BROWN, FRANCIS O. KANE. 

